How to cut string for fio?

Question

PostgreSQL

Good afternoon, please tell me the regular expression so that the line of the form
Surname First Name Patronymic becomes the type Surname I.O.

Answer 1

No way. Surnames/first names can contain spaces, hyphens and apostrophes - it is impossible to determine unequivocally where the surname ended and the name began
https://habrahabr.ru/post/259121/

echo preg_replace('/(\s[А-ЯЁ])[а-яё]+/u','$1.','Фамилия Имя Отчество');